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https://hdl.handle.net/10356/95591
Title: | Shape-controlled synthesis of MnO2 nanostructures with enhanced electrocatalytic activity for oxygen reduction | Authors: | Xiao, Wei Wang, Deli Lou, David Xiong Wen |
Keywords: | DRNTU::Science::Medicine::Biomedical engineering | Issue Date: | 2010 | Source: | Xiao, W., Wang, D., & Lou, D. X. W. (2010). Shape-Controlled Synthesis of MnO2 Nanostructures with Enhanced Electrocatalytic Activity for Oxygen Reduction. The Journal of Physical Chemistry C, 114(3), 1694-1700. | Series/Report no.: | The journal of physical chemistry C | Abstract: | In this work, three types of MnO2 nanostructures, viz., microsphere/nanosheet core−corona hierarchical architectures, one-dimensional (1D) nanorods, and nanotubes, have been synthesized employing a simple hydrothermal process. The formation mechanisms have been rationalized. The materials have been thoroughly characterized by X-ray diffraction, Brunauer−Emmett−Teller spectrometry, field-emission scanning electron miscroscopy, energy dispersive spectroscopy, and transmission electron microscopy. The microsphere/nanosheet core−corona hierarchical structures are found to be the layered birnessite-type MnO2, while 1D nanorods and nanotubes are of the α-MnO2 phase. These MnO2 nanostructures are used as a model system for studying the shape/phase-dependent electrocatalytic properties for the oxygen reduction reaction, which have be investigated by cyclic and linear sweep voltammetry. It is found that α-MnO2 nanorods/tubes possess largely enhanced electrocatalytic activity compared to birnessite-type MnO2 core−corona spheres despite the latter having a much higher specific surface area. The vast difference in electrocatalytic activity is discussed in terms of crystal structure, oxygen adsorption mode, and exposed crystal facets. | URI: | https://hdl.handle.net/10356/95591 http://hdl.handle.net/10220/8311 |
DOI: | 10.1021/jp909386d | Schools: | School of Chemical and Biomedical Engineering | Rights: | © 2009 American Chemical Society. | Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | MAE Journal Articles SCBE Journal Articles |
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